Electromagnetic switch.



B.J.MURPHY.

ELECTROMAGNETIC SWITCH.

APPLICATION FILED JUNE 5, 1913.

1,109,245, Patented Sept. 1, 19M

inventor-z Edwin J.Murph5,

H is oqttpr-ngsqf Witnesses:

UNITED STATES PATENT OFFICE.

EDWIN J. MURPHY,

OF SCHENECTADY, NEW YORK, ASSIGNOR TO' GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

ELECTROMAGNETIC SWITCH,

'To all whom it may concern Be it known that I, EDWIN J. MURPHY, a

citizen of the United States, residing at Schenectady, in the county of Schenectady, State of New York, haveinvented certain new and useful Improvements in Electro- My invention relates to electromagnetic switches for controlling electric circuits, one

of theobjects of my invention being to provide a switch of this character which has a small number of parts, is sim 1e and rugged in construction, and relia lo and efficient in operation.

In the drawings in which I have illustrated my invention, Fi re 1 is a side elevation of the switch em odying my invention partly broken away to show the construction; Fig. 2 is a. front elevation of the same; Figs. 3 and 4 are perspective views of the switch; and Fig. is a detail of construction showing the electrical connections to the pivot of the switch contact.

Referring to the drawing, 10 represents the base of insulating material, to which is secured an L-shaped frame 11 of ma etic material such as iron or steel. This rame is secured to the base by bolts 12. v

13 represents a winding for operatin the switch and 14 is the core for the win ing. The core is secured to the frame so as to make a good magnetic fpath for the flux between the core and the ame. The movable contact member or switch arm consists of an armature member 15 which is in the form of a yoke having two arms 16 pivoted to the frame at 17. The switch shown in Figs.

1 and 2 is of the double pole type, that is, there are two contacts insulated from each other on each switch. For each contact there is a contact support 18 consisting of a head 19 and a shank 20 which enters a perforation in the armature member as hereinafter described. Pivoted to each head is a contact 21 cooperating with a fixed contact 22 located in the arc chute 23, the contact being secured to the insulating base. The construction of the contact and the means for making electrical connection therewith are shown in Fig. 5. The pivoted contact support is provided with two ears 24 one on each side of the contact, and a pivot pin 25 passes through the contact and is prevented from turning by the pin 26. One

Specification of Letters Patent.

Application filed June 5, 1913. 'Seriat No. 771,794.

Patented Sept.'1, 1914.

end of the pin is provided with a head that entersone of the ears an'd bears againfi the-contact while the'other end is screw- -threaded andpasses through a bushing 27 which'also bears against the contact. The flexible conductor is-provided with a terminal 28 which is bent over the head of the bushing anda nut 29*locks the terminal be-. tween the head of the bushing and the nut.

The flexible conductor is carried back and connected through the base as shown. Good electrical connection is thus obtained between the support and the contact through the pivot pin without in any way impairing the mechanical efficiency of the pivotal connection. Between the head 19 and the contact proper'is a spring 30'which is com- -sliariks'=for the contact support are then placed -in'the a ert-ures withins'ulating material surroun' i'ng'them so as to make a snug fit. Insulation is also placed between the head and the armature member asshown. The clamping member 34 is then placed over them and a bolt 35 passed through the parts to hold them in place. *VVith this arrangement it is possible to secure good insulation between the contact and the support and at the'same time a good mechanical joint is made between them. In case, however, the switch is of the single pole type, the same armature member is used, that is, the same casting is utilized, but inasmuch as it is unnecessary to insulate the contact the construction is much simpler. All that is necessary in this case is to drill a hole 31 into which the shank is inserted and a pin driven through the hole 36 to hold the shank in place. It will be noted that the pivotal point 17 of the armature member is some distance back from the end of the frame 11 and the arms 16 are bent at an angle so as to bring the main armature body, the contacting face of which is marked 37, out beyond the pivot. This makes it possible to support the 1 switch arm in a posinonto" be" attracted a very simple" manner; 'A

by the core in screw having a head 38 is screwed into the engage the end of the magnet frame. By adjusting this ,.screw' head, the position of may be determined with accuracy. It will thus .beseen that the same parts, are used for. the single -pole, contactor as for the double pole contactor. The arrangement is.- such that a good, eflicient, magnetic structure, is produced with a small ,number of: com- 1 pactly arranged :parts; a

While I havegdescribedmyl inventionza s embodied, in concreteqfonn'and as operating in a specific manner iin'accordancecwith; the patent statutes, it should be, understood that I do, not l mitgmy invention thereto since various. modifications thereof Will-;, suggestthemselves to those skilled in the art without departing from the spiritvv of my tinvention,;the scope of. which is set forth in,

the annexed;claims.i. a

What Iclaimas newv and desire tosecure by Letters Patent of the Un'ited,States, is 1.,An electromagnetic switch eomprisjing, a frame of,magnetic material a rnagnetiza irg winding therefor, an armature pivoted to saidframe a-tcontaetisupport having a shank 1 entering an aperture 1n the armatureat substantially right angles to the axis of,- saidarmature, and acontaet pivoted to said support onan axis parallelto theaxis of,

the armature.

2. An electromagnetic comprising;

a frame ofmagnctic materi'aha magnetizing Winding therefor, an apertured armature, pivoted atosaid ,frame divided through the.

aperture into-two parts a contactsupport having a shanlr. entering {said vaperture, means for securing cthe'two partstogether to clamp the support, and .a contactzpiyoted,

to said support on, an axis parallel tothe axi of the armature;

3., -An electromagnetic: I i

a frame of magnetic material, a magnetizing windingtherefor,1zan apertured arma-- "tore pivoted to said frame, a shank entering the aperture having a head, a contact pivunder side of the armature body so as to otedtosaid head, and a spring interposed between the head and the contact tending to turn "the latter on its axis. 1 the-switch member in its deenerglzed position An electromagnetic switch comprising a frame of magnetic material, a magnetizing winding therefor, an armature pivoted to said frame, ashank entering an aperture.

in the armature at substantially right angles 'to the axisof said armature, a head for said shanln' a contact pivoted to said head,and .a'springjnterposed{between the head and the contacttendingto turn the latter on its axis.

5. Anelect-romagnetic switch, comprising a frame- 0f magnet material, a magnetizingwinding therefor, an armature having two aperturespivotedto. said frame and divided-through the apertures into two parts, twowcontact supports each having a shank aentering one of said apertures, means for I se curing thetwo partsvtogether to clamp the -=supports, and a Contact pivoted to I each support on -an axis parailcltothe axis of the armature: 7 v

16. An electromagnetic switch comprising i a iframe ofmagnetic materiaha magnetizing .windlngtherefor, an armature having 1 two aperturespivoted; to said frame and di- .vi'ded through; the apertures two ,contact supports each into two parts,

having a head and a shank entering. one of said apertures, ,nifeans I for securing the. :two parts together to clamp the supports, a contact pivoted to 'each head onan axis parallel to the axis of the armature and a spring interposed between the head If the contact tending to. turn theiatter uits axis.

, lnwitn essuwhereof, I have hereunto set mvhand this 3rd dayot June, 1913.

EDWlN J. MURPHY. 1f \Yitnesses:

a ENJAM N BQH L H EN OBFORDt Y 

